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International System of Units
Yes
Four.
1) It is an international standard, so all scientists use the same measurements. For comparison, for example, different countries have different definitions of a pound. 2) Calculations are easier, because of the decimal prefixes.
You can use either. Of course, using the standard system (centimeters) is preferable. If measurements are given in inches, by adding the sides, the final result will also be in inches. If sides are given in anstroms, perimeter will also be in angstroms. Etc.You can use either. Of course, using the standard system (centimeters) is preferable. If measurements are given in inches, by adding the sides, the final result will also be in inches. If sides are given in anstroms, perimeter will also be in angstroms. Etc.You can use either. Of course, using the standard system (centimeters) is preferable. If measurements are given in inches, by adding the sides, the final result will also be in inches. If sides are given in anstroms, perimeter will also be in angstroms. Etc.You can use either. Of course, using the standard system (centimeters) is preferable. If measurements are given in inches, by adding the sides, the final result will also be in inches. If sides are given in anstroms, perimeter will also be in angstroms. Etc.